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|a 10.1094/PDIS-09-23-1809-PDN
|2 doi
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|a eng
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|a Tseng, Yi-Wen
|e verfasserin
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|a First Report of 'Candidatus Phytoplasma australasiaticum' Associated with Phyllody, Virescence, and Witches'-Broom Disease in Chrysanthemum morifolium in Taiwan
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|c 2024
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 06.02.2024
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a Chrysanthemum morifolium (Asteraceae) is commonly grown as commercial cut flowers or pot mums worldwide. Common diseases of chrysanthemum include bacterial blight, fungal diseases, viruses, and phytoplasmas (Verma et al. 2003; Taloh et al. 2020). In June 2022, C. morifolium plants showing virescence, stunting, witches' broom, and phyllody symptoms were observed in 10 plants representing 10% of the estimated 100 plants in a field in Taichung City, Taiwan (Fig. S1). Three symptomatic samples along with three asymptomatic ones were collected for further study. Nested PCR was performed with two primer sets, P1/P7 (Deng and Hiruki 1991; Schneider et al. 1995) and R16F2n/R16R2 (Gundersen and Lee 1996) to amplify nearly full-length of 16S rDNA from the collected samples. The target 1.2-kb DNA band was only amplified from the symptomatic chrysanthemum plants. The amplicons were sequenced and a representative sequence deposited in GenBank under accession number OR501416. This sequence was used to search GenBank database by the Basic Local Alignment Search Tool (BLAST) program through the web service of National Center for Biotechnology Information (NCBI). In the 16S rDNA analyses, the three randomly picked amplicons from chrysanthemum phyllody phytoplasma (CPP) shared 100% identity with one another, and all shared 99.5% identity with the, 'Candidatus Phytoplasma australasiae' reference phytoplasma strain (Y10097). Further analysis using iPhyClassifier (Wei et al. 2007) revealed that CPP was most similar to the pattern of the peanut witches' broom phytoplasma in the 16SrII-A subgroup (GenBank Acc. No. L33765), with a pattern similarity coefficient of 1.0. For confirmation, the secY gene was amplified by secY-F/R primers (Li et al. 2014), the 1.2-kb band was sequenced and deposit in GenBank (Acc. No. OR508986). BLAST analysis showed that the secY sequence of CPP shared 99.93% of sequence identities to several 'Ca. P. australasiaticum' strains (MN543069, CP097312, CP120449, KC953013, MW085916, MW070030, CP040925). The phylogenetic tree analysis based on the secY gene by MEGA11 employing maximum-likelihood algorithm was performed and the bootstrap value was set as 1000 times for support of the stability for the clades. The result showed that CPP is closely related to other strains in 16SrII group (Fig. S2). Taken together, CPP is a 'Ca. P. australasiaticum' related-strain in 16SrII-A subgroup. This is the first report of chrysanthemum as a host of this phytoplasma in Taiwan, and might have an impact to the horticultural industry and the growers
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|a Journal Article
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|a Chrysanthemum morifolium
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|a Phytoplasma
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|a phyllody
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| 650 |
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|a virescence
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| 650 |
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4 |
|a witches’-broom
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| 700 |
1 |
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|a Chang, Chung Jan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jan, Fuh-Jyh
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
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|d 1997
|g (2024) vom: 06. Feb.
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|u http://dx.doi.org/10.1094/PDIS-09-23-1809-PDN
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